DVAM-02 (0-99.9v and 0-50A)
Combination Digital Panel Voltmeter and Ammeter
Do you have a requirement to measure DC voltage and current in the Ham Shack, on the test bench, in your motorhome or boat or for monitoring a solar panel array? The DVAM-02 is a versatile and inexpensive panel meter which can measure DC voltages from 0 to 99.9v and current flow from 0 to 49.9 amps.
The compact panel meter contains dual LED displays. The top display in Red LEDs shows voltage measurements from 0 to 99.9 volts, while the bottom display in Amber shows current measurement from 0 to 49.9 amps.
- Display Color: Red (voltage) + Yellow (current)
- Display Mode: Dual 0.28” LED digital display
- Update Rate: Approximately 500ms
- Physical Size: 48 x 29 x 26 mm (L x W x H)
- Opening Size: 45 x 26 mm (L x W)
- Supply Voltage: 3.5-30V
- Measurement Range (Current): DC 0.00-49.9A
- Measurement Range (Voltage): DC 0.00-99.9V
High Current Handling
Included with each panel meter is an external 50 amp shunt. The shunt is a very accurate resistive device. When current is passed through the shunt it is measured with the meter. Some lower-quality meters feature an onboard shunt but limit the usable current they can manage. With the external shunt, currents of up to 50 amps can be accurately read.
Connecting The Digital Panel Meter
Connection - Most Common
The most common setup for the voltage and current meter is to get the power needed to run the meter from the load you are measuring. This is possible when the load voltage is between 3.5v and 30v DC. With this method, the thin negative (black) connection lead does not need to be attached to anything.
Connection - Isolated Power Supply
An alternate operating method for the voltage and current meter requires a separate power supply to provide power to the meters. The power supply is isolated from the load and is selected when the load voltage exceeds 30v DC.
Calibration and Zero Adjustment
Periodic adjustment of the meter is possible. With the meter turned off (power removed), apply a short (jumper) between test points A and B. With the jumper in place, apply power to the meter which will be automatically calibrated to zero. Remove the jumper placed between A and B.
The current display can also be adjusted through the trim pot R7. Simply apply a known current across the meter of approximately 25A (mid-way between the maximum value). Adjust R7 until the meter displays the correct current reading.